[情報]youtube無法觀看比1080更高的解析度

看板iOS作者haleytll時間6年前 (2019/02/24 21:09)推噓13(14推 1噓 13→)

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作者 haleytll (騎郎鑽地板) 看板 iOS 標題 youtube無法觀看比1080更高的解析度時間 Sun Feb 24 21:09:03 2019 ─────────────────────────────────────── 心得：不曉得大家有沒有發現，不管是iphone、ipad、mac(chrome可以)，在youtube上除了1080p 之外，更高的解析度已經消失不見了原因來自於Google所使用的VP9編碼，在apple系統上並不支援，導致了所有蘋果系統最高只能至1080p HDR 至於何時能夠支援VP9…擲筊都問不出來 ==================== 原文： The YouTube app for iOS has received an update that adds support for high dyna mic range video on the iPhone XS and iPhone XS Max, but at the same time conti nues lack an option to view 4K-resolution video. The update to version 13.37 of the iOS YouTube app adds new options to the vid eo quality settings, with compatible clips now showing the letters "HDR" next to the resolution to denote the high dynamic range content. HDR options can be to the resolution to denote the high dynamic range content. HDR options can b e selected manually, but the Auto quality option will also enable HDR if it is available for the currently-viewed video. HDR enables for a wider range of colors in a video to be displayed on a compat ible screen, such as is the case for the Apple TV 4K and a supported HDR-enabl ed 4K TV. The effect can allow for a brighter, detailed, and more vivid pictur e, with less color banding and other digital approximation artifacts. The OLED displays used in the iPhone XS and XR offer high contrast ratios, ena bling it to be suitable to view HDR content, both created by the onboard camer as and those downloaded or streamed to the device through online services. The addition of HDR to the app for the XS range was not announced by YouTube.T he release notes for the app version simply state it includes bug fixes and im proved its performance, with no mention of additional device support for HDR. The YouTube app has had HDR support since May, specifically for the iPhone X,w ith the latest update extending that same support to the newer models. While HDR support is likely to be welcomed by users of those devices, the app continues to avoid providing any higher resolution options than 1080p, with 4K continues to avoid providing any higher resolution options than 1080p, with 4 K content displayed on the iPhones at a downsampled resolution. The problem is not only restricted to iPhones, as iPads with higher-resolution displays and the Apple TV 4K are unable to play 4K or higher-than-1080p content. The issue is also evident on macOS, as while Chrome can offer YouTube videos a t up to 4K resolution, Safari is limited to only 1080p at most. The problem is likely to be down to Apple's lack of OS-level support for Googl e's VP9 codec, used by YouTube. While it remains unclear when or even if Apple will include VP9 support in its software and devices, it is also unknown if G oogle will work around Apple's decision not to use the codec in software as it has done on the Xbox One, if only to enable 4K or 1440p video streams on hard ware that could play it. 出處：https://is.gd/OgDlQr -- ※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 111.71.31.113 ※ 文章網址: https://www.ptt.cc/bbs/iOS/M.1551013747.A.0C4.html ※ 編輯: haleytll (111.71.31.113), 02/24/2019 21:22:07

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